Wet brakes on 385 Case IH

[shirgeo]

I have a 385 Case IH and having problem with loosing left brake after the tractor sets over night. Bleed the system and have full brake again for the rest of the day, but let the tractor set over night and I loose the left brake. I replaced the left master cylinder but still have the same problem. Can anyone help?

 

[art]

Your problem would be the servo on or in the axle.

 

[shirgeo]

Your problem would be the servo on or in the axle.

Thanks:
Do I need to remove the final drive and planetary?

 

[RickB]

Thanks:
Do I need to remove the final drive and planetary?

Yes, and the fuel tank and fenders.